How to get out out of camera view?
To get out of Ctrl+NumPad0 which goes in camera view, you can use any "moving" command MMB  (or Alt LMB , if Emulate Three-Button Mouse is enabled, which it typically is for touchpad setups. It is enabled by selecting Emulate Three-Button Mouse under the Input tab in the Blender User Preferences.)

Some numpad commands :

Home center 3D View

NumPad0 camera Perspective

NumPad1 front ortho

Ctrl+NumPad 1 back ortho

NumPad3 right ortho

Ctrl+NumPad3 left ortho 

NumPad7 top ortho 

Ctrl+NumPad7 bottom ortho

NumPad5 toggle between perspective and ortho

NumPad 4/6, 2/8 roll scene left/right, up/down 

Ctrl+NumPad 4/6, 2/8 scroll scene left/right, up/down

Shift+NumPad 4/6 roll scene clockwise / anti-clockwise

NumPad+ zoom in

NumPad- zoom out

NumPad. focus on the selection